Spring undercutter



Dec. 3, 1929. DOUGAN 1,737,708

SPRING UNDERGUTTER Filed Aug. 51, 1927 gnaw x 501 /rc/1/e' E P 7 attovmua Patented Dec. 3, 1929 UNITED STATES ARCHIE F. DOUG-AN, 0F COCHR IT, OREGON SPBING UNDERCUTTERJ Application filed August 31, 1927. Serial No. 216,604.

My invention relates to my United States Patent No. 1,586,662 issued June 1, 1926, upon spring undercutters and the same relates thereto and differs therefrom, in that the body, and log engaging element, of my new and improved device is made of a single piece of material.

The object of my present invention consists in providing a simple and efiicient device for use by buckers in logging camps and consists primarily of a log engaging dog having rearwardly extending therefrom a body element upon which the saw supporting wheel is attached, the same being adapted to being Q5] moved longitudinally of the body member and to being fixedly secured thereto.

A further object of my device consists in providing a simple and eiiicient device for use by buckers in logging camps and consists primarily of a log engaging dog having rearwardly extending therefrom a body element upon which the saw supporting wheel is attached, the same being adapted to being moved longitudinally of the body member and to being fixedly secured thereto.

A further object of my device consists in providing a spring undercutter that will be cheap in construction, one that will not easily get out of order, that is light in weight, made of a minimum amount of material and one that may be adapted for use by the sawyer with the least amount of effort.

With these and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claim, and a preferred form of embodiment of which is hereinafter shown with reference to the drawings which accompany and form a part of this specification.

In the drawings Fig. l is a side elevation of my assembled device.

Fig. 2 is a top, plan view, of the mechanism illustrated in Fig. 1.

Fig. 3 is an enlarged fragmentar view, partially in section, of the groove; wheel ppsitioned upon the body pm tien of the de- VJ-E s Fig. 41is an end, sectionalview, taken on line t4t of Fig. 3', lookingin the direction indicated.-

Like reference characters refer to like parts throughout: the several views.-

1 is the shank of my device, having a head 2, disposed uponathe forward end of the same. The shank 1 is attached to the head portion at a point between the point 3, and the driving head 4. The shank 1 of the device is curved rearwardly of the head element 2, as illustrated at 5, to incline the head portion at an obtuse angle on its underside to that of the body. The shank 1 tapers from the end where it joins the head 2 to the opposite end. This is to allow it to bend uniformly. It is desirable that the shank be made of material having considerable springiness such as is utilized in making leaf springs for vehicles and the like. In sawing operations, the shank carries a wheel (hereafter described) which carries the saw when an under cut is being made, or bears upon the saw when an upper cut is being made. In either instance, if the shank 1 is sprung somewhat, it will constantly endeavor to assume normal or unsprung condition, and in doing so, will as constantly urge the saw into the cut that is being made. A slidable element 6 is mounted upon the shank 1, having a grooved wheel 7, mounted upon one end of the same and having a fastoning element 8 in threaded relationship with the slide 6, to lock the slide relative to the shank of the device and to facilitate its positioning and locking relative to the shank by the sawyer using the same. The grooved wheel 7, is journaled about the journal bearing 10 of the slide and the collar 9 maintains the grooved wheel upon the journal bearing. To prevent the loss and disengagement of the grooved wheel from the slide, I have found that best results obtain wherein I upset the end of the bearing to maintain the collar 9 in fixed position upon the journal 10. To permit of the application of the saw at either side of the shank, I form the rearward end of the shank cylindrical in form, as illustrated at 11, and form a central cylindrical section 12, within the slide so that by the lea; of the slide at the farthest ward extremity of the shank, the same may be made to rotate about the shank. A threaded element 13 is secured thereto to permit of the removal of the slide from the shank when desired.

WVhile the form of mechanism herein shown and described is admirably adapted to fulfill the objects primarily stated, it is to be understood that it is not intended to confine the invention to the one form of embodiment herein shown and described, as its susceptible of embodiment in various forms, all coming within the scope of the claim which follows:

WVhat I claim is:

A saw guide comprising a log engaging driving head having a penetrating point, an elastic shank projecting from the side of the head and curved backward from the point and tapered to distribute its bending capacity, and a saw engaging guide adjustable along said shank.

ARCHIE F. DOUGAN. 

